Obstetrical use of the ultrasonic Doppler instrument.
D005260:Female; D005313:Fetal Death / Q000175:diagnosis; D005318:Fetal Heart / Q000502:physiology*; D006326:Heart Auscultation / Q000295:instrumentation*; D006801:Humans; D011247:Pregnancy; D011258:Pregnancy Tests; D011271:Pregnancy, Ectopic / Q000175:diagnosis; D011272:Pregnancy, Multiple; D014465:Ultrasonics